After being arrested for a Harris County shooting that killed a 17-year-old last year, an 18-year-old is now accused of another deadly shooting in Houston's Midtown from earlier this year. Arrest in deadly Midtown shootingWhat we know:Harris County court records confirm police's announcement Wednesday of a murder charge filed against Jefferson Velasquez. Related articleSeparate murder chargeDig deeper:Records show that Velasquez was already in Harris County custody for another deadly shooting. Another suspect, 19-year-old Enrique Aguilar, was also arrested for the deadly teen shooting. RELATED: 19-year-old now charged for 2 teen killings at separate Harris County parties