From Dennis Detwiller's Tumblr:

“A Victim of the Art” is a Delta Green scenario set in the fictional town of Glenridge, Long Island. The investigators play Delta Green agents and/or friendlies brought in to solve a series of grisly murders which have rocked the small, rich, seaside community.

The killer is not human – but the perpetrator is.

A PDF of the scenario is available at the Tumblr page.