What is the record of a jury finding a defendant guilty of multiple murder in a single incident?

In June 1989, a jury found Welch guilty of six counts of first degree murder in a single incident occurring on December 8, 1986. It also found him guilty of two counts of attempted murder in connection with the same incident and one count of concealing a firearm as a felon. The jury found true a multiple-murder special-circumstance allegation. (Pen.Code, 190.2, subd. (a)(3).) At the penalty phase, the jury returned a death verdict, and the trial court sentenced him to death. We affirmed this judgment in 1999. (People v. Welch (1999) 20 Cal.4th 701, 85 Cal.Rptr.2d 203, 976 P.2d 754 (Welch ).)