CARROLL, Iowa (AP) – A state investigator says a Minnesota man admitted robbing a convenience store and killing the clerk in northern Iowa during an interview after his arrest. Mike Krapfl testified today (Wednesday), in Carroll, during the first-degree murder trial of Michael Swanson, of St. Louis Park, Minn. He was 17 when he was charged with killing Sheila Myers in Humboldt last November.

Krapfl testified that Swanson told agents that he walked in the store with a gun in a bag. He said the clerk put money in the bag and he shot her and left. Swanson said he shot Myers “to tie up loose ends” because she could identify him. Swanson also said he “felt powerful.”

The jury spent part of the morning watching a videotape of the interview.