(CBS4) – The Fort Collins woman accused of shooting and killing her ex-boyfriend and the father of her child was officially charged with first-degree murder in Boulder County Court on Tuesday. Devan Schreiner is accused in last Wednesday’s shooting death of Jason Schaefer in Longmont.

Jason Schaefer (credit: USPS)

Police believe Schreiner approached Schaefer on Oct. 13 while he was at a group of neighborhood mailboxes on Heatherhill Street by Renaissance Drive, shot him several times and then ran off. Schaefer died at the scene.

Devan Schreiner

Devan Schreiner (credit: Boulder County)

Both Schreiner and Schaefer had worked for the U.S. Postal Service in Longmont but Schreiner was fired about two weeks before the deadly shooting. The two share a child and police said that Schaefer was trying to change his parental custody agreement.

Devan Schreiner

Devan Schreiner in court on Tuesday (credit: CBS)

The judge on Tuesday also scheduled Schreiner’s preliminary hearing for January.

Jennifer McRae