Former USFL assistant coach Greg Patrick, who also spent two seasons as Arizona’s defensive line coach, has died, the league confirmed Thursday in a statement. He was 53.

Patrick, who last coached for the New Orleans Breakers last season, reportedly passed away on Sunday, according to The Arizona Republic. His cause of death was not immediately known.

"It is with heavy hearts we share our deepest sympathies on the recent passing of two members of the USFL family, coach Greg Patrick and linebacker Jessie Lemonier," the league said in a statement.