. >> reporter: vince kendall's son lives next door and got a call from police saying the suspect followed his mother inside and knocked on the door. >> when she opened the door, he slammed her in the face, and knocked her down and broke her nose. of the suspect leaving the scene, he sayings he's grateful it wasn't worse. >> if he's that big or strong, he could have killed her. >> reporter: vince kendall is just the latest victim in a string of violent armed robberies. police say what happened to her follows the suspect's pattern, preying mostly on elderly women entering their homes. he shows a gun or knife and problems them and anyone else who might be around. he also is suspected of robbing two middle aged men. earlier this month, police say 91-year-old elizabeth was choked and robbed at gunpoint by the same man. the suspect described as 40 to 60 years old, investigators believe the man first struck in ridgewood queens robbing a 76- year-old woman and an 87-year- old man inside their home. he then targeted neighborhoods committing three armed robberies this month, a pattern his victims w