Michael Swanson, who killed two women in 2010 and was convicted of murder in 2011, is charged with attempted murder for allegedly slashing a fellow prisoner in Coralville.

Swanson, 21, and Michael Ivester, 33, are scheduled to stand trial together on Sept. 15.

Authorities say Ivester held down another inmate at the Iowa Medical and Classification Center in on Nov. 13. 2014, while Swanson slashed the inmate’s neck. The man reportedly required 15 stitches.

Swanson, of St. Louis Park, Minnesota, was 17 years old when he shot Sheila Myers at a Humboldt convenience story on Nov. 15, 2010. He shot Vicky Bowman-Hall at an Algona convenience store earlier the same night.

Both women were survived by husbands and children.

Webster County District Court Judge Thomas Bice gave Swanson the mandatory sentence of life in prison without the possibility of parole for the first-degree murder and first-degree robbery for killing Myers. He shot her in the face with a .40 caliber Beretta handgun, loaded with hollow point bullets, and left the Kum & Go store with $31 and some cigarettes. He was later arrested in Webster City when he stopped at a McDonald’s restaurant for food.

Swanson pleaded guilty to first-degree murder and first-degree robbery for Bowman-Hall’s death and received another life sentence.

During the plea hearing and sentencing, Swanson told the court that he walked into the Crossroads convenience story that night armed, and shot Bowman-Hall with the intention of killing her.

Following a 2012 United States Supreme Court ruling that threw out automatic life sentences for juveniles, in 2013, Gov. Terry Branstad commuted the life sentences of 38 Iowa inmates convicted as juveniles, including Swanson, to terms of 60 years in prison before they could be eligible for parole.

Ivester is serving time for an out-of-state conviction.