Winnebago County State's Attorney Joe Bruscato has announced murder charges for suspect allegedly involved in the deaths of four in Rockford on Dec. 20.

Calvin L. Carter, 22, has been charged with four counts of first degree murder in connection with the deaths of 24-year-old Martia Flint, her two sons, 6-year-old Tyrone Smith III and 4-year-old Tobias Smith, and  24-year-old Demontae Jones.

If convicted, Carter could face up to 45 years in prison for each count.

According to WREX, Carter turned himself in on Saturday in Madison County, just outside of the St. Louis area. It is being reported that he had a "relationship" with Flint.

Officers responded to the residence in the 3200 block of Montrose Ave. in Rockford just after 11:15 p.m. Dec. 20 after a report of gunshots. Officials say a neighbor heard pounding on a door, then the sound of a door being forced open, followed almost immediately by gunshots.

Four gunshot victims were located inside of a residence. All were pronounced dead by Rockford Fire Department paramedics.

Rockford Police announced Dec. 23 they had recovered a gun and other evidence possibly connected to the four deaths.

According to police, detectives searched several houses in the area and recovered the handgun and other evidence during those searches. The items were expected to be examined by Rockford Police crime scene detectives and the Illinois State Crime Lab.