MINEOLA - The partner of slain Nassau Officer Artie Lopez took the stand Friday at Darrell Fuller's murder trial.

Clarence Hudson told jurors he and Lopez got off the Cross Island Parkway in October 2012 and came up behind the car allegedly driven by Fuller. Lopez got out of their vehicle and Hudson says he heard a pop, then saw Lopez fall backward after he was shot once in the chest.

The prosecution replayed part of the police radio transmissions between Lopez, Hudson and their sergeant. In the transmissions, Hudson is heard calling for an ambulance, saying Lopez had been shot and that the suspect took off.

Fuller is facing murder charges in the deaths of Lopez and motorist Raymond Facey, who police say was shot by Fuller during a carjacking.