The former Michigan linebacker who sent a series of cryptic and threatening tweets last week issued an apology via his Twitter account Sunday night. Elysee Mbem-Bosse tweets -- which have since been deleted -- were seen as threatening enough that they were being investigated by campus police, and Michigan coach Jim Harbaugh -- who was tagged in one of the tweets -- said it was "a serious matter."

Mbem-Bosse tweeted the following apology on Sunday night.

According to Michigan, Mbem-Bosse has not been a member of the football team since mid-November. Mbem-Bosse said he left the team to deal with a family emergency and was never given a reason why he's no longer a member of the football team.