Matt Damon’s father dies at age 74

Kent Damon (left) and his son, actor Matt Damon, at Massachusetts General Hospital Cancer Center fund-raiser in 2012. –Bill Brett for The Boston Globe

Matt Damon’s father has died after a long battle with cancer, the actor’s publicist confirmed to the Globe.

Kent Damon, 74, had suffered from a rare blood disease known as multiple myeloma, and his condition had worsened in recent months. He died Dec. 14, according to Damon’s publicist, Jennifer Allen.

Damon talked about his father’s health while promoting his latest film, “Downsizing,’’ telling “Extra’’ that the prognosis was not good. Multiple myeloma is a cancer of the plasma cells in bone marrow.