A former NFL lineman from Pennsylvania who killed himself at 25 had a brain disease that has been linked to repeated blows to the head, researchers confirmed Wednesday.

Adrian Robinson Jr.'s diagnosis of chronic traumatic encephalopathy was confirmed through officials at a brain bank at Boston University.

Family lawyer Ben Andreozzi said that Robinson had several concussions during two seasons in the league.

Robinson played for Temple in college before playing for Pittsburgh, Denver and San Diego in the NFL.

"He went from being one of the nicest guys you'd ever want to talk to, to having a darker edge at times," Andreozzi said. "The family started noticing changes in his behavior, and didn't know why."

The family has not filed a lawsuit over his death in May. But thousands of former players have sued the NFL over concussions, claiming the league withheld information about damaging effects of repeated head blows.

Pack loses Richardson

Sean Richardson was placed on season-ending injured reserve by the Packers after the safety suffered his second neck injury in three years.

The fourth-year player, a reserve, got hurt in practice last week and missed the 24-10 victory over the St. Louis Rams.

Ironhead tribute costs

Steelers defensive end Cam Heyward says he was fined by the NFL for paying tribute to his late father.

Heyward tweeted that the league penalized him for writing "Iron Head" on his eye black during a game.

Heyward's father, Craig, spent a decade as a running back in the NFL and went by the nickname "Ironhead" for his physical style of play.

Craig Heyward died in 2006 at the age of 39 following a lengthy battle with cancer.

Etc.

•Former Patriots offensive lineman Sam Adams died in Houston at the age of 67. No cause of death was released. Adams joined the Patriots in 1972 and spent most of his career with them, finishing with New Orleans in 1981.

•Jaguars quarterback Blake Bortles participated fully in practice, three days after spraining his throwing shoulder.

•Bills starting safety Aaron Williams will miss at least eight weeks because of a neck injury.

•Patriots offensive tackle Nate Solder was placed on season-ending injured reserve because of a torn bicep muscle.