NORTH KINGSTOWN, R.I. -- The mother-in-law of the Boston Marathon bombing suspect killed during a gun battle with police says her family is "sickened" by the horror he inflicted.

Judith Russell's daughter Katherine, 23, was married to Tamerlan Tsarnaev (tsahr-NY'-ev), an ethnic Chechen who came to the U.S. from Russia. She says her family realizes they never really knew him. She said in a statement Friday the family can't begin to comprehend the tragedy.

The Russell family lives on a cul-de-sac in a wooded, suburban neighborhood in North Kingstown, R.I. Neighbor Paula Gillette says Katherine Russell left for college a few years ago and when she came back she would dress in Muslim garb with head coverings.

Tsarnaev and his brother are the suspects in Monday's marathon bombing, which killed three people and wounded more than 180. The brother is on the loose.

The Washington Post quoted neighbors Friday saying that Tsarnaev and his wife had a baby daughter, according to neighbors.

The newspaper also reported that Tsarnaev was arrested in 2009 and charged with domestic assault and battery after allegedly assaulting his girlfriend, according to Spotcrime.com, an online source of crime information.

Stephanie Guyotte, a spokeswoman for the Middlesex County, Massachusetts, District Attorney, told Bloomberg News that Tsarnaev was arrested on the charge but said he wasn't convicted.