New York State Democratic Sen. Kevin Parker tweeted — then deleted — instructions to a GOP staffer, telling her “kill yourself” on Tuesday.

It all started with a tweet about a bike lane in New York, blocked by cars allegedly abusing placards to park where they shouldn’t. New York State Senate Majority’s deputy communications director Candice Giove dug a little deeper and claimed that one of the placards belonged to Sen. Parker — but the vehicle was not the same one to which the placard was legally assigned.

Parker responded with the now-deleted tweet instructing Giove to “kill” herself.

Amid the backlash, Parker offered an apology after deleting the tweet, conceding that he should not have joked about so serious a topic as suicide.