Jerry Koosman, the legendary New York Mets pitcher and 1969 World Series champion, was a father of three children and grandfather of four. Following his death on November 1, 2026, at the age of 83, attention has turned to the family behind the celebrated baseball star. Koosman shared three children, Michael, Shawn and Danielle, with his former wife, LaVonne Sorum. He also leaves behind grandchildren, brothers and a family history deeply connected to his Minnesota upbringing.
Who Was His Family?
Jerry Koosman built a remarkable career in Major League Baseball, but his personal life remained closely connected to his family.
The former Mets pitcher was married to LaVonne Sorum, with whom he raised three children.
Their children are Michael Koosman, Shawn Koosman and Danielle Koosman.
He was also the grandfather of four grandchildren named Riley, Colton, Katlyn and Dalton.
His family relationships became a subject of renewed interest following his passing in Wisconsin.
Although Koosman spent years in professional sports, his children and grandchildren generally maintained lives away from the national spotlight.
Jerry Koosman’s Wife
LaVonne Sorum was Jerry Koosman’s former wife.
The couple married on February 11, 1967, shortly before Koosman established himself as a major league pitcher.
Their marriage began during an important transition in his professional career.
As Koosman developed into one of the New York Mets’ most recognizable players, LaVonne was part of his life through the demanding years of professional baseball.
The couple remained married for several decades before divorcing in 2003.
Their marriage lasted approximately 36 years.
Although their relationship eventually ended, they shared the responsibility of raising three children.
How Many Children?
Jerry Koosman had three children: two sons and one daughter.
His sons are Michael and Shawn, while his daughter is Danielle.
All three were born during the broader period when Koosman’s baseball career and family responsibilities shaped his life.
The children grew up with a father whose professional achievements included a World Series championship and a long career in Major League Baseball.
Despite their father’s fame, they did not become widely known public figures.
Their names appeared in family and obituary information following Koosman’s death.
Michael Koosman
Michael Koosman is Jerry Koosman’s son and is married to Christine.
Michael has an unusual connection to the early history of the New York Mets.
According to the Society for American Baseball Research, he became known as the first “Met baby.”
He was born during Jerry’s rookie training camp in St. Petersburg, Florida.
The distinction linked Michael’s birth to an important moment in his father’s developing professional career.
At the time, Jerry was preparing to establish himself in Major League Baseball.
Michael’s birth became a memorable family milestone during those early years.
Although his father’s accomplishments brought the Koosman name into baseball history, Michael has largely remained outside the sports media spotlight.
Shawn Koosman
Shawn Koosman is Jerry and LaVonne’s second son.
According to the family’s obituary information, Shawn is married to Kimberly.
Compared with his father’s public baseball career, relatively little information about Shawn’s personal and professional life has been widely reported.
He is identified among the immediate family members who survived the former Mets pitcher.
The obituary’s acknowledgment of Shawn and his wife reflects the family’s continued importance in Koosman’s later years.
No reliable public information in the supplied sources establishes that Shawn pursued a professional baseball career.
Danielle Koosman
Danielle Koosman is Jerry Koosman’s daughter.
She is married to John Tamblyn, according to family obituary details.
Danielle is the only daughter among Jerry and LaVonne’s three children.
Like her brothers, she has generally maintained a private life despite her father’s longstanding recognition in professional sports.
Her name appeared alongside Michael and Shawn in reports about the family following Jerry’s death.
The three siblings represent an important part of the legacy Koosman leaves beyond his achievements on the baseball field.
His Grandchildren
Jerry Koosman was also a grandfather to four grandchildren: Riley, Colton, Katlyn and Dalton.
Their names were included in the family’s obituary following his passing.
The public information does not clearly identify which of his children is the parent of each grandchild.
For that reason, individual family relationships should not be assumed without further confirmation.
Koosman’s role as a grandfather reflected another chapter of his life after retiring from professional baseball.
While his pitching achievements remained part of his public identity, his grandchildren were part of the family he built over several generations.
Parents and Childhood
Jerry Koosman was born on December 23, 1942, in Appleton, Minnesota.
He grew up in a farming family, an upbringing that helped shape his early years before professional baseball.
His father was Martin Koosman, and his mother was Lydia Graese Koosman.
Both parents died before him.
Growing up in rural Minnesota, Koosman developed the work ethic and determination that later became associated with his baseball career.
His journey from a farming community to a World Series championship remains one of the distinctive stories in Mets history.
Brothers and Sister
Koosman came from a family that included two brothers and a sister.
His brothers were Orville Koosman and Elton Koosman.
Elton is married to Clarice, according to the family’s obituary.
Jerry also had a sister, Violet Dilly, who was married to Bob Dilly.
Violet died before Jerry.
His surviving brothers were among the relatives acknowledged following his death.
These family connections reflect the Minnesota roots that remained an important part of Koosman’s identity throughout his life.
Final Days
Jerry Koosman died on November 1, 2026, at his home in Osceola, Wisconsin.
He was 83 years old.
Reports indicated that he had been dealing with multiple illnesses and declining health during his final year.
His death was reported as occurring peacefully with his children around him.
For the family, his passing marked the loss of a father, grandfather and brother.
For baseball supporters, it marked the death of one of the central figures in the Mets’ historic 1969 championship team.
Family Legacy
As of November 2026, Jerry Koosman is remembered not only for his baseball achievements but also for the family he raised with LaVonne Sorum.
His three children are Michael, Shawn and Danielle, and his four grandchildren are Riley, Colton, Katlyn and Dalton.
His surviving family also includes his brothers Orville and Elton, while his parents and sister Violet preceded him in death.
Koosman’s public legacy includes 222 Major League Baseball victories, the 1969 World Series championship and the retirement of his No. 36 jersey by the New York Mets.
Yet beyond those accomplishments, his family remains a central part of his personal story, connecting the celebrated pitcher to the generations who survive him.
