Update, 4/18 at 8:55 p.m.
RANCHO VIEJO, Texas (ValleyCentral) — The Texas Department of Public Safety says a Matamoros man was the one killed on Monday evening in the fatal 18-wheeler crash.
Francisco Guadalupe Salinas Casas, 47, a resident of Matamoros, died at the scene when his tractor-trailer rig slammed rolled over and burst into a fireball of flames.
DPS said Salinas-Casas was transporting hazardous-flammable material northbound on Toll Road 550 at an unsafe speed and lost control of the vehicle, causing it to strike a concrete barrier and roll on its side.
An overturned 18-wheeler burns out of control near Rancho Viejo. By Mia Morales 
An overturned 18-wheeler burns out of control near Rancho Viejo. By Mia Morales 
An overturned 18-wheeler burns out of control near Rancho Viejo. By Mia Morales 
An overturned 18-wheeler burns out of control near Rancho Viejo. By Mia Morales
State Highway 550 remains closed westbound between Baker Lane & IH-69E.
Law enforcement personnel investigating the accident are working on accident reconstruction and this segment of SH 550 will remain closed.
DPS is asking if anyone witnessed the fatal accident as it occurred, to call the Weslaco DPS Office at (956) 565-7600.
