The video comes from a security camera at the Suffield Tavern, and sources familiar with the investigation said that Michael Koistinen, 24, can be seen drinking at the bar the night of Oct. 29.
The state police are also investigating the response by Windsor Locks police.
Sources said local officers responding to the scene did not seek a blood test from Koistinen to check his blood/alcohol level and never administered a Breathalyzer test.
Under state law, a motorist can refuse to give a blood test or urine test or take a Breathalyzer test, but a written refusal is required. The refusal is reported to the Department of Motor Vehicles and can be used to revoke a driver's license.
DMV spokesman William Seymour said Tuesday that his department has no record of Windsor Locks police submitting paperwork indicating that Koistinen refused to take any of the tests.
Ha Tran, Henry Dang's 22-year-old brother, said the family believes Windsor Locks police handled the crash differently because it involved one of their own.
"We always felt like police officers are here to help us. But now they are trying to cover up for one of their own. They know the law. They know how to cut corners," Tran said as he sat in the family's apartment, across the street from the entrance to the town's police station.
Dang's family has hired Hartford attorney James D. Bartolini to represent them. Bartolini said that while he has hired his own investigators, he believes the state police and the Hartford state's attorney's office are investigating the circumstances surrounding the crash.
"I believe there is a very thorough investigation going on by the state police that is looking at all aspects of this matter including any actions by Windsor Locks Police Department, as well as actions of the vehicle operator," Bartolini said.
Sources familiar with the investigation said state police also have obtained a search warrant for Michael Koistinen's cellphone records. The sources said state police are trying to determine if the officer was on his cellphone at the time his car hit Dang.
In addition, state police are trying to determine the role that Sgt. Robert Koistinen played on the night of the accident. He was the duty sergeant in charge that night and was on the scene, according to several sources.
Tran said Windsor Locks Police Chief John Suchocki told the family that the elder Koistinen responded to the scene because of manpower issues.
"We feel, personally, that he should have excused himself,'' Tran said. "Their lame excuse [for why Sgt. Koistinen responded to the scene] was that there were only three cruisers on duty."
The Courant submitted a series of questions to Suchocki Tuesday concerning his department's handling of the fatal accident. The chief declined to answer, referring inquiries to the state police since they are now investigating.
Suchocki said that Michael Koistinen is on administrative leave with pay. He could not be reached for comment Tuesday.
The North Central Connecticut Accident Reconstruction Team — which includes police officers from a number of area towns, including Windsor Locks — was called into investigate the crash, but that was several hours after it occurred and long after Michael Koistinen had been taken to a hospital in Stafford Springs, at least a half hour away from the accident site.
The reconstruction team was removed from the case three days after the crash by Hartford State's Attorney Gail Hardy, who asked state police to handle the case because of concerns about the initial investigation.