NEW YORK -- Mark McGwire's youngest brother says in a book proposal that he injected the former baseball star with steroids, according to Deadspin.com.

Jay McGwire is circulating a manuscript titled "The McGwire Family Secret: The Truth about Steroids, a slugger and Ultimate Redemption," the Web site reported Wednesday. Jay McGwire, a body builder, said his brother started using steroids in 1994 and that he injected Mark with Deca-Durabolin.

"Mark is a man I think most would like to forgive because his reason wasn't nefarious -- it was for survival," the proposal says, according to the Web site. "My bringing the truth to surface about Mark is out of love. I want Mark to live in truth to see the light, to come to repentance so he can live in freedom -- which is the only way to live."

Jay McGwire, who says he has a strained relationship with his brother, could not be reached for comment.

Mark McGwire repeatedly has denied using illegal performance-enhancing drugs. When he testified under oath before Congress in 2005, however, he wouldn't discuss whether he did.

"Who knows what might have happened if I didn't get Mark involved with all the training, supplements, the right foods, steroids, and HGH?" the Web site quoted Jay McGwire as writing. "He would not have broken any records, and the congressional hearings would have gone on without him. Maybe Barry Bonds wouldn't have ever gotten involved with the stuff, either."