Emergency crews reportedly rushed to the former linebacker’s home in Malibu around 12.51pm, where he was pronounced dead at the scene.
Butkus was found unresponsive by a friend who went to check on him, reported TMZ.
In a statement released on Thursday night, Butkus’ family confirmed the Chicago Bears icon had died “peacefully” overnight, going on to thank his fans and loved ones for their support.
“The Butkus family confirms that football and entertainment legend Dick Butkus died peacefully in his sleep overnight at home in Malibu, California,” they wrote via the Bears account on X, formerly known as Twitter.
“The Butkus family is gathering with Dick’s wife, Helen.