HOUSTON – Police say a grandmother was shot and killed while she slept during a gang-related drive-by shooting in north Houston overnight.

According to the Houston Police Department, it happened at about 3:15 a.m. Monday in the 600 block of Sunnyside near McGallion.

Investigators said 63-year-old Brenda Reyna was an innocent bystander when she was shot and killed during the incident.

Reyna’s family said she was a teacher’s aide at Jeffersin Elementary School.

Investigators are not releasing many details at this time, but said six people - her spouse, son, son’s spouse and their two young children - were home during the shooting.

No one else was injured.

Investigators said it was not clear who the target was in the shooting, but that the victim's son is a documented gang member.

A neighbor, Jose Perez, said he was watching TV when he heard the gunshots. He said he ran across the street.

Perez said he tried to help Reyna’s husband with her, but there was nothing they could do.

The neighbor added that he saw bullet shell casings from a rifle outside on the street. They added that they were about a dozen shots fired.

Police have not released a description of the suspect vehicle and are still interviewing witnesses.