SFPD are asking for help in the search of 73-year-old Kenneth Chin, who suffers from dementia. According to KTVU, Chin was escorted by caregivers at his Richmond District assisted living home, Nacario Care Home, onto a bus on Thursday, which took him to a senior center for the day, but he never came back.

Forty volunteers and eight search and rescue dogs combed Golden Gate Park on Saturday, but there was no sign of Chin. Police continued to canvass the area today.

Here's SFPD's description of Chin:

On February 24, 2011, at around 1530 hrs. Kenneth Chin, 73, was last seen in the area of 35th Avenue and Balboa Street. Chin is described as an Asian male, 5'10", 172 lb, black hair and brown eyes. Chin was last seen wearing a black jacket, long sleeve blue denim shirt, blue jeans, and black velcro shoes.

If located, contact SFPD Missing Persons at 415-558-5508 or B.R.i.C.C. 415-553-1071 after hours.