Until last week, there were virtually no bombings and only a handful of drug-related killings.
Domingo may well be one more victim in a series of drug-related killings.
It was the second drug-related killing inside the prison in three months.
"It doesn't sound like a drug-related killing to me."
He pleaded guilty to second-degree murder in 1980 for a drug-related killing, drawing a sentence of 15 years to life.
The biggest difference between 1991 and 1977, Captain Johnston said, has been the increase in drug-related killings.
Her 15-year-old sister already has one baby, whose father was murdered in a drug-related killing.
There were 4,427 drug-related killings in the state of Chihuahua in 2010.
Crime experts said one reason has been a decline in drug-related killings, as drug dealers have found less lethal ways to settle disputes.
He is charged with the drug-related killing of the son-in-law of a Colombian police official.