The ex-girlfriend of University of Colorado assistant coach Joe Tumpkin has obtained a restraining order against Tumpkin, claiming he physically assaulted her multiple times over the course of their three-year relationship — most recently on the nights before and after a CU football game.

Tumpkin, 45, has been the safeties coach at CU for the past two years.

He assumed defensive play-calling duties in the Buffs’ bowl game last month after defensive coordinator Jim Leavitt left for a job at Oregon, and is one of the candidates to replace Leavitt.

CU Athletic Director Rick George released a statement Friday afternoon saying he was looking into the claims against Tumpkin.

“We are still gathering details about the very serious allegations in this filing,” George said. “Once I’ve reviewed it, I will get together with Coach (Mike) MacIntyre and we will take whatever action is appropriate and necessary.

“I expect all our student-athletes and employees to conduct themselves appropriately on and off the field.”

Tumpkin’s ex-girlfriend filed the complaint with Boulder County courts on Dec. 20 and a judge granted a temporary restraining order, according to the court filing. A hearing to determine whether it will be made a permanent restraining order is scheduled for Jan. 31.

According to the complaint, the woman — who is from Tumpkin’s home state of Michigan — said the two have been dating for about three years and that she would fly to Colorado to see Tumpkin once every 10 days or so.

The woman said the first assault occurred on Feb. 27, 2015, at a hotel in Broomfield, when she alleges he threw her against a wall and then threw her on the bed when she tried to leave, according to the complaint..

“The assaults increased in duration and severity” when she temporarily moved in with Tumpkin in Broomfield for the summer of 2015, according to the complaint. The woman said Tumpkin would sometimes also choke and bite her, and would threaten to kill men she expressed interest in, according to the complaint.

The most recent incident came Nov. 18, on the eve of the CU Buffs’ game against Washington State. The woman said she agreed to come out for the game, but that Tumpkin arrived intoxicated to a house in Broomfield and jabbed his finger in her face and then pinned her against a wall and choked her, according to the complaint.

The night after the game, the woman claims Tumpkin threw her around and choked her before dragging her by her hair to the door and telling her to “get the (expletive) out,” according to the complaint.

While the report indicates that the woman did call police, at this time, Tumpkin has not been arrested in connection with any of the allegations, according to court records.

Tumpkin has no criminal record in Colorado, according to records.

Attorneys for both Tumpkin and the woman did not return requests for comment on Friday.

The temporary protection order prohibits Tumpkin from going within 100 yards of the woman or her home. Because the complaint contains allegations of domestic abuse, Tumpkin is also prohibited from possessing firearms while the order is in place.

Mitchell Byars: 303-473-1329, byarsm@dailycamera.com or twitter.com/mitchellbyars