Let me step you through my reasoning to try and identify the bearded man and the driver of the blue car.
The state started to spread a story based on the allegations of a two-time convicted killer in January 1983. Robert Bond alleged Paradiso confessed to picking Joan up at Logan in a gypsy cab, taking her to his boat at Pier 7, hitting her in the head with a whiskey bottle, raping her, and then took his boat out and dumped her in Boston Harbor.
Point 1: Records revealed Leonard Paradiso was targeted by police by January 1982, a full year before authorities declare a break in Joan's case because of Robert Bond's allegations.
Point 2: I learned from records Sgt Carmen Tammaro first introduced the boat theory on August 1, 1982. He then led the interview with Robert Bond on January 14, 1983, after previous meetings, and Bond regurgitated Tammaro's same story about the boat. During the interview, Bond did not know the cause of death for Joan and gave the officers a choice for them to choose. Much of Bond's interview and written statement were known to be false with known facts at the time. But one element was true more than seven years before Joan surfaced. The way the story came out, what the officers chose from Bond's recitation, was a blow to the head. Bond gave correct detail, information that would only be known to the killer or someone complicit in the crime.
Point 3: I could then identify two individuals who knew the correct cause of death with correct detail: Carmen Tammaro and Andrew Palombo. That puts these two individuals right at the top of the suspect list for involvement in Joan's murder. However, neither man fit the eyewitness description of the bearded man with Joan; they are both too big.
Point 4: The eyewitness report said Joan and the bearded man moved to a blue car at Logan. I looked at the two men above who might fit what we know about the driver of that car.
Familiar with protocols at Logan for cabs and livery services. CT - yes, AP - yes
Credentials to get into the cab line. CT - yes, AP - yes
Could blend into the cab line without drawing attention. CT - no (he was a uniformed desk sergeant), AP - yes (he was an undercover cop)
Familiar with Route 107 where the purse was tossed. CT - probably had familiarity of the Boston area, AP- yes (he was the lead officer on the Iannuzzi case, and Route 107 was the main route from his home to Logan)
Familiar with the Park Square Greyhound Bus Station. CT - yes, AP - yes (there was a police report of undercover police activity at the bus station)
Familiar with Chebacco Rd, the gravesite. CT - doubtful (this was a very remote area and CT did not live in this area, AP - yes (he lived close to the area, Hamilton police chief confirmed AP knew the area)
Point 5: The police and the Websters suppressed the eyewitness lead and instead went after a scapegoat, Leonard Paradiso.
Point 6: Knew Paradiso. CT - yes (they grew up together), AP - yes (he was the lead on the Iannuzzi case)
Point 7: Knew police methods and how to divert an investigation. CT - yes, AP - yes
Andrew Palombo is a suspect as the man driving the blue car. His superior, Carmen Tammaro, was the originator of the Paradiso boat theory funneled through Robert Bond.
A final point, Bond was interviewed by an investigator and attorney on my behalf. Bond told them that the man from NJ, referring to George Webster, sent people to see him. Tammaro, Palombo, and Tim Burke all worked closely with George Webster. For the authorities and the Websters to suppress the eyewitness lead, and the investigation took the course that it did, it is reasonable to conclude they all know who the man was. Otherwise, why hide the lead?
In the best-case scenario, the Websters framed a man for Joan's murder. It is a reasonable conclusion, they had something to hide. Simplified motive, Joan lost her life to shield the Webster's image. What is there in their background that would result in such a travesty? I believe that is what I discovered when I found the letter.