A definite no to the death penalty, even "DNA evidence" doesn't on it's own necessarily prove that someone is guilty, as it is basically "that person had contact with" (or as has happened more than once "the lab or police handled the samples badly").
There have been far too many instances of convictions that were considered "rock solid" at the time due to "the best scientific evidence" only for them to be overturned years or decades later because it turned out evidence was mishandled, or suppressed, or a test wasn't as accurate as originally thought.
On an intellectual level I don't like the death penalty for the fact that no legal system is flawless and there is almost always a chance it's going to result in a wrongful conviction, there is also an element of the goalposts moving once you've started using it, and lobbying for it to be used for lesser crimes especially when you've got people advocating for it because it's cheaper than prison.
On an emotional level, I would rather someone who has committed murder etc be stuck in a cell, as death feels like an easy way out for some of these criminals and some of the crimes especially given how many will kill themselves anyway, and for terrorists killing them can make them martyrs.
On a technical level IIRC pretty much every study done has shown the death penalty makes little difference in the number of people committing the crimes, detection (solving the crime and catching the criminal) makes much more of a difference*, and if you say put in the death penalty for rape then there is absolutely no reason for the criminal to leave the victim alive and a very big incentive to kill them (as that gives them a much better chance of getting rid of the evidence).
For example the death penalty doesn't help victims 2-5+ if you don't take case 1 seriously and find the criminal quickly, and criminals that know the chances of getting caught/stopped are low are far more likely to commit and keep committing their crimes.
*As does changing the circumstances in which people get involved in crimes, for example prohibition in the states created a massive and very lucrative market for criminals and led to large numbers of deaths as people that previously were not generally criminals got involved and fighting between factions got worse, or prostitution where there have been countless studies that have shown you reduce the crimes that "go with" prostitution" (especially the violent crimes) if you regulate it and make the actual act legal and safe and instead crack down on the actual criminals who take advantage of the opportunities that arise from having the sex workers and clients scared to go to the police.