FORT LAUDERDALE, Fla. (AP) — Four years, five months and four days after Nikolas Cruz murdered 17 at Parkland’s Marjory Stoneman Douglas High School, his trial for the deadliest U.S. mass shooting to reach a jury begins Monday with opening statements. Delayed by the COVID-19 pandemic and legal wrangling, the penalty-only trial is expected to last four months with the seven-man, five-woman jury being exposed to horrific evidence throughout. The jurors will then decide whether Cruz, 23, is sentenced to death or life without the possibility of parole. “Finally,” said Lori Alhadeff, who wants Cruz executed for murdering her 14-year-old daughter Alyssa. “I hope for swift action to hold him responsible.” All victim’s parents and family members who have spoken publicly have said directly or indirectly they want Cruz sentenced to death. The former Stoneman Douglas student pleaded guilty in October to the Feb. 14, 2018, massacre and is only challenging his sentence. Nine other U.S. gunmen who fatally shot at least 17 people died during or immediately after their attacks by suicide or police gunfire. Cruz was captured after he fled the school. The suspect in the 2019 killing of 23 at an El Paso, Texas, Walmart is awaiting trial.