Connecticut is poised to become the 17th state without the death penalty and the fifth in five years to abolish it. Gov. Dannel Malloy is expected to sign the repeal bill approved by the Legislature in recent days.

Connecticut is part of a growing movement against capital punishment, with repeal measures now proposed in California, Florida, Georgia, Kansas, Kentucky and Washington. Other states like Ohio, Oregon and Pennsylvania are reviewing their death penalty laws.

This shift comes at a time when new analyses of capital punishment show gross injustice in its application and enormous costs in continuing to impose it. In Connecticut, a powerful, comprehensive study provided evidence that state death sentences are haphazardly meted out, with virtually no connection to the heinousness of the crime.

In California, two former death penalty proponents — a prosecutor who drafted the 1978 ballot initiative that expanded the state’s death penalty and a leading supporter of the 1978 law — are now championing a new ballot measure to repeal the penalty. They point to a study showing that, since 1978, California has spent roughly $4 billion on the death penalty to carry out 13 executions. “The cost of our system of capital punishment is so enormous that any benefit that could be obtained from it — and I now think there’s very little or zero benefit — is so dollar-wasteful that it serves no effective purpose,” Donald Heller, the drafter of the 1978 measure, said recently.