There are several things that don't add up to suicide in this case. I use the FARO scanner for work they talked about in the last episode, I also do trajectory, blood stain pattern analysis and am training in firearms examination.
To summarize what doesn't make sense, I would consider the following points. It was stated the body was in full rigor (locked into position due to the decomposition process) which takes several hours to set in. This does not fit the timeline for the stories given by witnesses or the 911 call.
Lividity, or livor mortis, (purple blue tint that is easily seen) was present in two different parts of the body that indicates the dead body was likely face up (lividity on the back of the calf) then moved to face down leaning into the tub (causing lividity to his front side). Lividity is caused by blood settling due to gravity once the heart stops pumping. The best explanation for this is that the body was moved at some point.
The bullet trajectory makes no sense for where the body is positioned and where the bullet ended up. The wound on his head shows the bullet was traveling right to left and slightly downward. The bullet exited the left side, but somehow left no mark on the wall of the tub. There was however a hole in the wall behind and above him. Based on the wound indicating a right to left and downward trajectory, he would have been standing and facing the opposite way based on the hole in the wall. This also indicates the body was moved.
The FARO scanner, once uploaded and the scans processed, creates a 3D model of crime scenes. It looks like a very realistic video game with very small error rates, usually only a few millimeters if scanned correctly. The model indicated the body would have been in the way of the door opening if it was always in the position it was found in. No witness mentioned having a hard time getting the door open. So this calls into question if the door was actually open and not closed like the witness said.
Blood stains found in the bathroom also indicate the door was open when the shooting occurred, as blood stains were found on what would have been the exterior of the door (if it was closed). The types of blood stains that were found were apparently also of the type that show directionality (where they came from). These are made from blood flying through the air and indicated the blood came from inside the bathroom, if the door was open. These factors support the door being open and not closed as stated by witnesses.
Next is the position of the gun. It was located under the body and under his left leg. The bullet entered the right side of his head, which would indicate the gun was in his right hand. It would make the most sense that the gun would be on his right side or somewhere close to where his right hand ended up. You don't necessarily drop the gun once you shoot yourself. There is no more muscle control, so your fingers don't straighten out, they generally stay in like a loose grip position. So the gun falling from a kneeling position and then bouncing over to be under his left leg is improbable.
The condition of the bullet is interesting as well. They stated there was material embedded in the bullet that was consistent with drywall, which supports the hole in the wall being the fatal bullet. This supports the idea he was moved into the tub again. An interesting note about the bullet though is it seems like they indicated the hollow point bullet didn't expand like it is designed too (it opens up and looks a bit like a flower). This can happen if the hollow point gets plugged with material. It wasn't mentioned, but the bullet passed through both sides of the skull and didn't expand before hitting the drywall and picking up that material (supposedly). This is interesting because the bullet is intended to expand once it hits tissue. With the contact wound to the head, it should have hit tissue first. Either the bone plugged the hollow point or deformed it enough that it didn't expand for this to work, although I don't think they mentioned it being deformed. This opens up the possibility the bullet that was recovered wasn't the fatal bullet and only hit drywall. This is assuming the bullet wasn't deformed or plugged by the skull first.
These thoughts are only based off the podcast as I haven't seen any of the actual items of evidence though.
Hope the summary helps.
