Investigators said a Houston area man got brutally violent with his own grandparents while they were sleeping in bed.
Police say a couple in their 60's fell victim to their grandson Thursday around 1 a.m. Police say 20 year-old Oscar Lopez attacked his grandparents by hitting and biting them.
There was a struggle and at some point police said, Lopez chewed his grandmother's arm.
The injury was so bad neighbors said there was blood all over the hallway.
When police arrived they had no idea what they were getting into. They said they had to tase Lopez in order to get him under control.
It's still not clear what cause Lopez's violent behavior. Lopez and grandparents were taken to Memorial Hermann Hospital. His grandmother is in serious condition.
Lopez is now facing charges including injuring the elderly.