Here's the summary bit:
So, what do the established facts show? They show Richard Allen was on the trail, including the bridge, around the time of the murders. He was wearing a blue jacket. He matches the visual depiction of bridge guy caught on Libby's phone, regardless of eyewitnesses' accounts. He lied to his wife about being on the trail. A black 2016 Ford Focus, the type of vehicle Richard Allen owned and which was only registered to one person (i.e., Richard Allen) in Carrol County, arrived at the trail just prior to time the murders taking place.
After the murders, Richard Allen voluntarily approached police when he thought they believed bridge guy was only a potential witness. At the time he approached police, he had no idea bridge guy was caught on the victim's phone recording because police told the public the video came from a trail cam. After coming forward, he told police he was at the bridge around the time of the murders and that no other men were present. He also told police he was using his cellphone on the trail the day of the murders, but his cellphone does not ping off of any nearby cell tower. Around this time, Richard Allen sought to increase his height by two inches on his fishing license and has provided no reason for doing so. He also presumably discards of his cellphone somewhere around this time.
There is then a transcribing error, and the report of this encounter goes unnoticed for five years.
In 2022, the error is corrected. Upon having his home searched, Richard Allen twice told a searching officer, "it doesn't matter; it's all over." The officers found a gun that at least two experts determine matched the discharged, unspent round found at the crime scene. The officers also found a blue Carhart jacket that matched the jacket bridge guy was wearing. Police also located over twenty previous cellphones used by Allen—but police cannot locate the phone he used during the time of the murders.
Upon being interrogated in 2022, five years after the murders, Richard Allen claims he was, in fact, on the bridge/trails hours prior to the murders. He is then arrested.
Richard Allen goes on to confess to the murders over sixty times while awaiting trial. In these confessions, he provides details relating to (1) the cause of death, (2) the surroundings of the bodies, and (3) nearby vehicle traffic that were never released to the public.