An elderly woman is expected to recover after being stabbed in the chest Monday evening in a Boulder townhouse, and police say they've taken a family member into custody.

The woman, whom police have not identified, knocked on a neighbor's door on Baldwin Place, northeast of Foothills Parkway and Valmont Road, around 7 p.m., according to police dispatchers, and told the neighbor that her son, who is mentally ill, stabbed her with a knife.

Police searched the woman's home at 4820 Baldwin Place but did not locate the son. According to dispatchers, the son then called police, telling them he had walked to the area of Independence Road and 57th Street.

Officers apprehended a man at gunpoint at that location around 7:40 p.m., according to dispatchers.

Boulder police spokeswoman Kim Kobel confirmed that a family member had been arrested and transported to Boulder County Jail, but refused to identify the suspect.

Dispatchers, however, repeatedly referred to the victim's son as Larry Marquardt, the same name listed in Boulder County property records as the owner of 4820 Baldwin Place.

The victim was out of surgery late Monday and expected to recover, Kobel said.

Boulder police Sgt. Paul Reichenbach said he couldn't provide additional details, but said there was no danger to the community.

"It's an active investigation," he said.