He was killed in the Palace of Justice siege in Bogotá.
Jacquin was a constitutional lawyer in the University of Atlántico, and became professor of law in the Free University of Barranquilla.
He was a brilliant orator and a close friend of Jaime Bateman and Carlos Toledo Plata.
He joined the M-19 movement at the beginning of the 1980s.
After a truce had been agreed in April 1984, he took part, along with Antonio Navarro Wolff, in an attack on the La Sabana tourist train between Bogotá and Zipaquirá.
For this action he was tried and convicted, but was pardoned by the Supreme Court of Justice.