Police are concerned for his welfare after he went missing from Chorley.
The 54-year-old was last seen around 9am yesterday (September 24th) in the Preston Road area.
He is described as white, 5ft 10in tall, of stocky build with short, dark-brown hair, and has several tattoos on his arms.
He may also be wearing a black coat.
Keith has links to the Preston area and police are appealing for any information to help find him.
PC John Wiggans, of Preston Police, said: “We are extremely concerned for Keith’s welfare and would urge anyone who has seen him to come forward.
“We believe he could be vulnerable and it is important we find him as soon as possible.
If you can help, please call 101 quoting log reference 1250 of September 24th.