Marshalltown murder suspect 'willfully without justification' shot Casey's employee, court documents say Marshalltown police arrested Rocky Trujillo, 20, Monday evening. He is charged with first-degree murder, first-degree robbery and more. Author: Khalil Maycock, Ryan Morris Published: 7:38 AM CST February 15, 2021 Updated: 12:31 PM CST February 16, 2021 MARSHALLTOWN, Iowa — Marshalltown police captured a suspect Monday night in a shooting that left a Casey's General Store employee dead earlier in the day. Rocky Dean Trujillo, 20, of Marshalltown is being held in the Marshall County Jail for the following charges: Murder – 1st Degree (Class A Felony) Robbery – 1st Degree – 2 Counts (Class B Felonies) Going Armed with Intent (Class D Felony)