It was members of the military escort that killed Ninoy.
Originally the murder was blamed on some criminal (Rolando Galman) whose bullet riddled corpse was left on the tarmac for all to see.
The only problem was that even though he was shot many times there was little or no blood. This indicates that the body was already dead when it was riddled.
The assassination was ordered by Danding Cojuangco, a relative of Ninoy as confessed by the assassin Pablo Martinez.
Evidently Ferdinand was livid when he heard of the incident.
edit
Rolando Galman, as stated by another answer, was already dead before Ninoy was murdered.
FYI
The military escorts were all jailed but have since been pardoned and released.
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age of president ninoy Aquino
Benigno Servillano "Ninoy" Aquino, Jr.
the talent of ninoy aquino is mangopaway og tawo
Difference of Jose rizal and ninoy Aquino?
NO SCHOOL ON NINOY AQUINO DAY.August 21, 2012, Ninoy Aquinao Day is a public holiday. The Filipino kids do not have school on this day.
Based on the Government Reenactment that was brodcasted in television ,Galman hid into the bottom of the stairs ,When Ninoy and his escorts are approaching to the van,Galman appeared and shot Ninoy in the head
Cory Aquino's husband is ninoy Aquino...ninoy died, and so did Cory...Cory died at the age of 76...just a lil xtra info =] R.I.P Cory and Ninoy Aquino.
Benigno "Ninoy" Aquino Jr. was assassinated on August 21, 1983, at the Manila International Airport in the Philippines. A military court convicted 25 military personnel, including the gunman, Rolando Galman, for the assassination. The exact mastermind behind the killing remains a subject of speculation and controversy.
1983
ano ang nagawa ni ninoy Aquino sa pilipinas?
ninoy aquino
ronaldo galman