MOUNT VERNON - Mount Vernon police say they are questioning a person of interest in the alleged killing of an 85-year-old woman known for her community service.

Hundreds marched in Mount Vernon Saturday to remember Emma Gruber, whom investigators believe was murdered after walking in on burglars at her home on South Sixth Avenue earlier this month.

Authorities say the burglars were stealing her water meter to resell the copper inside the device.

Gruber was initially reported missing after her grandson searched the upper levels of her home and could not find her. Police eventually discovered her body at the bottom of her basement stairs.

Gruber was a member of the Greater Centennial A.M.E Zion Church, where she served as an usher.

Police have not released details on how she was killed or about the person of interest.