It is from Soylent Green, and Charlton’s tears were REAL, as his dear friend Edward G Robinson was really, in fact, dying when he did that last role.
Haven’t heard of the movie and didn’t know any of that. Fascinating.
Did you see the NCIS-LA season where Miguel Ferrer, the son of Mel Ferrer and Rosemary Clooney, was dying and played the dying Owen Granger to the end?