WINDSOR, Conn. — Police have returned to the home of a man whose 2013 killing remains unsolved and whose daughter is presumed dead after she went out sailing with her son and their boat sank this year.

Police were seen at John Chakalos’ house on Tuesday as they revisited the cold case, The Hartford Courant reported. The FBI this month searched an abandoned property in Spofford, New Hampshire, owned by the Chakalos family.

Chakalos, a wealthy 87-year-old real estate developer, was found fatally shot at his home, and no arrests have been made. Chakalos’ grandson Nathan Carman, who survived the sailing trip with this mother, was a suspect in Chakalos’ killing.

Nathan Carman accompanied his mother, Linda Carman, on a September fishing trip from South Kingstown, Rhode Island. After their boat sank, the mother wasn’t found, but the son was found off Martha’s Vineyard.

Nathan Carman, of Vernon, Vermont, denies involvement in the killing of his grandfather, who left an estate worth more than $42 million to his four adult daughters, including Linda Carman.