I didnt know it at the time. But while at Robbie D. Wood i drove a truck that a driver died in. Truck didn't have a smell or anything. However I'm sure most companies will never inform you that your driving in a truck that the previous guy died in.
That would be my guess too. It would suck being the one in the truck before sanitized but it’s amazing what some elbow grease and sudsy water and disinfectant can do. Rip driver. I’m hoping he just went while he sleep.