MILTON, Ga. -- A 25-year-old Canton man is accused of killing the mother of his children in front of them.

Christopher Erdman waived his first appearance hearing Monday morning. He faces a number of charges, including murder, aggravated assault, cruelty to children and tampering with evidence.

According to Capt. Shawn McCarty with the Milton Police Department, Erdman shot 25-year-old Shannon Lawrence four times in the face and neck in the parking lot of the Birmingham Crossroads shopping center in Milton on Sunday.

McCarty said the former couple had two children together and used the shopping center as the drop-off point when exchanging custody of the kids.

The couple's children witnessed the shooting, according to McCarty.

Dispatchers received a call of shots fired at around 2 p.m.

CANTON, Ga. -- The Cherokee County Sheriff's Office has joined forces with other agencies to participate in "Operation Innocent Justice," a statewide proactive child pornography sharing investigation.

The sheriff's Internet Crimes against Children and V.I.P.E.R. units joined the investigation in October 2010.

As a result of this movement, three search warrants were executed in Cherokee County. Those warrants led to two county residents being charged wtih sexual exploitation of children.

During the search, images of suspected child porn were found on home computers.

The two suspects in this case remain at large, but police expect to arrest them in the coming days. A third search warrant was also executed; that case remains under investigation.