The winner will represent Etna, Fox Chapel, Highland Park, and Ross Township.
Turzai beat the former Hollywood screenwriter, according to unofficial results.
Follow along as the results roll in.
This was the only race in the nation between two incumbents.
Wolf defeated Republican Scott Wagner, multiple networks predict.
Republican Congressman Lou Barletta fell to the incumbent.
They were distributed at polling locations in East Liberty, Oakland, Shadyside and Squirrel Hill.
"This is absolutely a referendum on Trump in a community that has been devastated by hatred and bigotry that he has unleashed," one voter said.
Control of the U.S. House and U.S. Senate is on the line today.