The lack of corroborating evidence and Marina's poor memory are two reasons to discount her claim about Lee confessing to attempting to kill Edwin Walker.
Why would you not consider that the note in Russian LHO reportedly left for Marina, The photographs of Walker’s home which were reportedly found among LHO’s belongings in Ruth Paine’s residence, the bullet recovered from Walker’s home, all as corroborating evidence of Marina’s sworn testimony? (The lame excuses that we are fixing to be subjected to are just plain silly.)
- The note is undated and doesn't mention Walker. Which means it's worthless as evidence. I doubt it would've been admissible if Oswald went to trial for the Walker shooting.
- The photograph of Walker's home was found in Ruth Paine's home after LHO's death. It can't be proven that Oswald took the photo or brought it to her home.
- Walker himself denied that the bullet in evidence is the bullet that was recovered from his home. He described a different bullet and the initial police reports described a 30 caliber bullet, not the type of bullet that was used with a Mannliche-Carcano.
I stand by my view that LHO wouldn't have been convicted for attempted murder in the Walker case if he lived to stand trial. Marina wouldn't have been able to testify against him and there's no direct evidence connecting him to the crime.