Former kind-hearted NFL player Chris Smith passed away at the age of 31.

Chris Smith, a former defensive lineman who played with multiple teams during an eight-year NFL career, has passed away at the age of 31.

It was unclear how he died. Representatives for Smith confirmed his death to NBC News and said no further details will be provided at this time.

Smith's passing comes eight days after he played in an XFL game for the Seattle Sea Dragons. Not only was the defensive end on the field for Seattle's 34-33 loss on April 9 to the D.C. Defenders, but he had two tackles in the game. 

He went on to play a total of eight seasons in the NFL with the Cincinnati Bengals, Cleveland Browns, Las Vegas Raiders, and Houston Texans in 2021. He signed with the American minor league football team the XFL's Seattle Sea Dragons in March.

Smith played five games with the Sea Dragons this year, making five tackles.

Many of Smith's former teammates offered their condolences on Twitter, including Derek Carr and David Njoku.