The man was visiting Mission City Memorial Park on Sept. 14 when the attack occurred around 10;45 a.m., KGO reported.
In a news release from the Santa Clara Police Department, Capt. Wahid Kazem denounced "an unprovoked and ruthless attack, on one of the most vulnerable members of our society,"
"It's something that he does, almost on a daily basis, fairly religiously. He even brings a lawn chair. Sits by her side. And spends some time there with her," Kazem told KGO.
Kazem said the assailant robbed the victim and fled the scene on foot before riding away on a black mountain bicycle, according to the news release.
The victim was taken to an area hospital for treatment.
The attacker was described by police as a possibly Latino or Hispanic man between the ages of 35 and 50 with gray slicked hair, according to the news release.