Gun 'n shells @Tippit
Markham ID's Oswald as shooter
Others ID Oswald brandishing the pistol & dumping shells
Alternately, lets say Oswald keeps the shells, hides the gun on his person as he leaves the area.
He's captured but has no weapon or shells.
He can still be convicted for the shooting. I read that a witness can testify that a defendant shot someone, and if that witness is believed, then a defendant can be convicted even if no gun is ever found. I also read that juries are instructed that the testimony of only one witness is enough if that witness is believed.