Jason Alan Grimsley (born August 7, 1967) is an American former Major League Baseball relief pitcher who played for seven teams during a 15-year career.

Grimsley spent the entire 1992 season in the minors and on March 30, 1993, was released by Houston and signed with the Cleveland Indians.

Grimsley was the player who crawled through a Comiskey Park air conditioning duct to reach the room where the confiscated bat had been secured.

Grimsley did not appear in a major league game that year and was granted free agency on October 15.

On June 6, 2006, it was reported that Federal officials had raided Grimsley's home looking for evidence that he was distributing human growth hormone (HGH) and other performance-enhancing drugs.

[3] The Arizona Diamondbacks released him at his request, shortly after it became public in June 2006 that he had admitted to using performance-enhancing drugs.

[6] On June 12, 2006, Grimsley was suspended for 50 games for violating Major League Baseball's Joint Drug Prevention and Treatment Program.

ESPN reported that court documents showed that Grimsley had failed an MLB-administered drug test in 2003; he subsequently confessed to the use of human growth hormones, amphetamines and steroids.

[9] On September 30, 2006, the Los Angeles Times reported that Grimsley told federal agents investigating steroids in baseball that Houston Astros pitchers Roger Clemens and Andy Pettitte were users of performance-enhancing drugs and that Baltimore Orioles's Miguel Tejada, Jay Gibbons, and Brian Roberts were users of "anabolic steroids.

[11] On December 13, 2007, he was cited in the Mitchell Report, an investigation into the use of anabolic steroids and HGH in Major League Baseball.

[13] Grimsley had told investigators that he got amphetamines, anabolic steroids and human growth hormone from someone recommended to him by former Yankees trainer Brian McNamee.

The fact that McNamee was a personal strength coach for Clemens and Pettitte apparently prompted the Times to leap to the erroneous conclusion that Grimsley had implicated them in his statement.

[13] Grimsley is married to his wife Dana, and they have three children, two sons, Hunter and John-John, and a daughter Rayne.

[14] On January 21, 2005, a small plane crashed into the back of Grimsley's house in Overland Park, Kansas.