https://www.oyez.org/justices/byron_r_white
Not to sound like Les over here, but you do not know a Supreme Court Justice's heart until they are there. Whizzer White was appointed by Kennedy. He didn't turn out hard core conservative, but did write to support anti-homosexual laws and dissented on Roe and Miranda. That was not what JFK envisioned, I'm sure. Replaced by RBG.
Although more recent "liberal" appointments seem 100% toeing the party line. You know how the news is always "OMG gorsuch drifted" or whatever? When was the last (ever?) time the lib 4 didn't vote lock step?