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Dallas police are investigating two shootings that left two men dead in the span of four hours overnight.Police say the first shooting began as a robbery late Monday in a Pleasant Grove neighborhood in the 1900 block of Utica drive, near Bruton Road and South Buckner Boulevard.The victim and a witness were standing on a street corner when the gunman and three other men approached and demanded their property. They complied, but one of the robbers opened fire. The suspects fled in a white four-door sedan, possibly a Mercury.David Pimentel, 22, of Garland was taken to Baylor University Medical Center, where he died, authorities say.The second shooting happened about four hours later at an apartment complex in the 3900 block of Altoona Drive, near Walton Walker Boulevard and South Cockrell Hill Road.The victim was in an apartment at the Buena Vista Townhomes shortly before 1:30 a.m. when two men knocked on the door. After an altercation, the man was shot. A witness fled and called 911, and police found the victim lying between two buildings.No arrests were reported in either shooting, both of which remain under investigation this morning.