A man suspected of wielding a knife and trying to rob a home while a real estate agent was showing it during an open house in Commerce City has been arrested, police said.

Ernest Robert Chrisman, 43, was booked into the Adams County jail Thursday afternoon on suspicion of first-degree burglary, aggravated robbery and second-degree assault, police said in a news release.

The real estate agent told police she was showing the house about 11:30 a.m. Sunday in the 14700 block of 104th Avenue when someone came into the residence and tried to rob it, police said.

The robber threatened the woman with a knife and ordered her to turn over some belongings, police said. The real estate agent pulled a handgun and fired a shot at the robber, who fled. It was unknown if he was hit.