 In addition to the 23 year old male, an 18 year old man, a 19 year old woman and an 18 year old woman were also killed in the incident.
<fluency>  In addition to the 23 year old male, an 18 year old man, a 19 year old woman and an 18 year old woman were also killed in the incident.
 In addition to the 23 year old male, an 18 year old man, a 19 year old woman and an 18-year-old woman were also killed in the incident.