He was convicted of 11 murders, one attempted murder, 17 robberies, one rape, one attempted rape, one count of sexual abuse, two kidnappings and two thefts. He killed his victims in a variety of ways, such as stabbing, shooting, strangling, bludgeoning to death with rocks and slitting their throats. He was sentenced in 1980 to life imprisonment, the maximum sentence in Argentina, to be served in the high-security jail of Sierra Chica, near the city of Olavarria.
His last words before the court were "This was a Roman circus.
I was judged and sentenced beforehand."
In July 2000, he became eligible for parole. However, he didn"t submit a petition.
On May 27, 2008, Puch asked to be paroled. However, a judge denied his petition considering he is a threat to society.