A suspect was arrested in the brutal killing in Brazil of an American art dealer who was the co-owner of a prominent gallery in Manhattan, police said Thursday.

Brent Sikkema, 75, was found dead on Monday with 18 stab wounds in his Rio de Janeiro apartment.

Rio state police arrested a man who they identified as Alejandro Triana Trevez near the city of Uberaba, in the neighboring state of Minas Gerais. The man, who local media say is Cuban, was on the run and was found resting in a gas station.

Police said that Trevez allegedly took $3,000 from Sikkema’s home. Detective Felipe Curi, who leads the state police homicide unit, told CBN Rio that the main line of investigation is theft leading to homicide.