Wasn’t a falling bullet that isn’t possible. He was shot either intentionally or by a stray bullet intended for someone else.
It happens frequently. Some years ago a bullet came though the window of my mom's third floor apartment. From the hole in the window and the impact of the bullet in the floor, it had arrived at around a 45 degree downwards trajectory.
Sorry, it is indeed possible for a falling bullet to do critical/lethal damage.
A bullet is falling from the instant it leaves the muzzle. With enough horizontal velocity, it can do damage.
We developed a sudden water stain in the ceiling a number of years ago. It turned out to stem from a leak in the roof. We live in a 1917 rowhouse in DC. We had replaced the old tin roof 15 or so years earlier and the new tin roof, which should outlive us, was in fine condition. But there was a bullet hole in it. (We found the bullet.) Just some baseline Democrat voters out doing their thing. If a spent bullet can penetrate a roof, it could do real damage to someone's head.