His crimes spanned more than two decades, beginning when he was still a teenager, and the victims included children. Beyond the killings themselves, Tissier's case carried legislative weight — it directly prompted France to reform how its penal code addressed child murderers, leaving a procedural mark on the justice system that outlasted his convictions.

His criminal record began at sixteen with car theft and escalated to murder within two years of his release back to the New York area — a pattern that would repeat itself after his 1975 parole, when killings resumed after a brief dormant period. What distinguished the later phase of his crimes was their concealment: bodies were stored in garages, buried in basements, and transported across state lines, suggesting a sustained and deliberate effort to avoid detection. The cache of weapons, sedatives, and floor plans found at his Asbury Park home at the time of his arrest pointed to a criminal infrastructure well beyond the crimes he was ultimately charged with.

Over a span of roughly six weeks in the summer of 2010, Morris carried out a series of shootings in Tampa that left five people dead, including two police officers. The concentrated timeline and the targeting of law enforcement made the case unusually alarming for the city, and the resulting prosecutions produced three separate death sentences across two trials.