I mean you can. Ocean gate was a thing, I'm sure there's others.

To be fair, short of rapid depressurization or suicide, dying that way is hard to do in space. Modern spacecraft have relatively safe environments; no Trek style plasma conduits or transporters to screw that up. The impacts that radiation and zero-g have on the human body are also factored into the mission way in advance. Even crew homicide is carefully mitigated with psych evals and tests, prior to launch.

Instead you have a slew of less fun alternatives. Limited food/water/O2, heating, tumbling into the void on a spacewalk, navigation error, all set up slow and agonizing ways to go. Especially that last one - you could wind up knowing that you're going to die a whole month ahead of time, with nothing to do but wait.