That is not known for sure, but is unlikely that it was done by DeValera. It is more likely to have been done by former colleagues who disagreed with Collins. He was shot in his own part of the country, so it is a likely explanation, but it is not known for certain. There are many theories.
Michael Collins IS ALIVE
Michael Collins, an Irish revolutionary leader, was shot and killed on August 22, 1922 during the Irish Civil War.
Actually, Michael Collins did drink alcohol but not in excess. Like some men of Collins' era, Collins did not take the pledge (renouncing alcohol, whether one had trouble with alcohol or not. The pledge relied on one enduring act of will to keep sober for life)
Their names were Buzz Aldrin and Michael Collins. Collins stayed in the command module, and did not actually walk on the moon.
Michael Collins resides in south Florida.
Michael Collins didn't become a scientist, Micheal Collins was assassinated
Michael Collins had three kids, Ann, Kate and Michael jr.
Michael Collins was born on October 31, 1930.
Michael Collins was released on 10/11/1996.
The Production Budget for Michael Collins was $25,000,000.
Chad Michael Collins is 6'.