An elderly San Rafael man who went missing last week was found dead near Treasure Island on Saturday, authorities reported Tuesday.

The San Francisco County Medical Examiner’s Office identified the man as Martin Kaplan, 81, of San Rafael, but provided no information about the circumstances in which he was found.

Martin Kaplan located deceased near Treasure Island 8/3/19. The circumstances surrounding the death of Mr. Kaplan are still under investigation, we are asking that anyone who may have seen Mr. Kaplan prior to his disappearance pic.twitter.com/jBLhJUVeId — Marin County Sheriff (@MarinSheriff) August 6, 2019

Missing Person Martin Kaplan, 81 years old, was last seen in San Rafael yesterday around 2pm. We found his car and clothing near Loch Lomond Marina. @MarinSAR leading search today for Mr. Kaplan. If you see him please call (415)479-2311. pic.twitter.com/0wZ3vq83wt — Marin County Sheriff (@MarinSheriff) August 2, 2019

The Marin County Sheriff’s Office said Kaplan was last seen at his San Rafael home on Thursday around 2 p.m. Authorities found his car and clothing near Loch Lomond Marina on Friday.

A search by boat, UAV, helicopter and a ground search by the sheriff’s office’s search and rescue team did not find Kaplan Friday, said sheriff’s Sgt. Brenton Schneider.

The incident is under investigation.