A third artificial leg was discovered near the memorial for the Revere man who was killed in a shark attack at a Wellfleet beach last September, according to police.

The first prosthetic appeared in March, with the latest being discovered Saturday at Newcomb Hollow Beach.

“At this time it’s an active investigation and the motives are unknown as to why they are being left at the beach,” Wellfleet Police Lieutenant Michael Hurley said in an e-mail Friday.

The memorial, an engraved stone placed in the sand on the beach, is for Arthur Medici, who was boogie boarding on Sept. 15, 2018, when he was attacked by a shark and sustained fatal injuries to his right leg, the Globe reported.


Maria Lovato can be reached at maria.lovato@globe.com. Follow her on Twitter @maria_lovato99.