An assassination inside a coup attempt
On the morning of February 13, 1976, General Murtala Muhammed was travelling through Lagos when soldiers involved in an attempted coup ambushed his vehicle. Nigeria's 1976 Year Book records that Muhammed was assassinated during an attempt by a group led by Lt.-Col. Buka Suka Dimka to overthrow the six-month-old military government.
Muhammed's aide-de-camp, Lieutenant Akintunde Akinsehinwa, and his driver were also killed in the ambush. Elsewhere in the coup attempt, Kwara State military governor Ibrahim Taiwo was killed. These deaths formed part of a broader effort to seize power rather than an isolated street homicide.
The coup did not take control of the state
Dimka used the national broadcasting system to announce that the government had been overthrown. The announcement did not secure the military support the conspirators required. Loyal formations refused to join the coup, regained strategic locations and restored government control within hours.
Olusegun Obasanjo, then Chief of Staff at Supreme Headquarters, succeeded Muhammed as Head of State. The new government immediately began a wide investigation into the attempted takeover and the killings associated with it.
Dimka escaped, then was captured
Dimka initially escaped the collapse of the coup and was declared wanted. Contemporary and later historical records place his capture in early March 1976 after a nationwide search.
The investigation extended well beyond Dimka. Military officers, police personnel and civilians were arrested and screened for possible participation. The surviving record shows that defendants did not all receive the same outcome: some were executed, others received life or shorter prison sentences, and a significant number were discharged for lack of evidence.
Military tribunals and the first executions
The proceedings were conducted before special military tribunals rather than ordinary civilian courts. The Federal Military Government stated that investigative boards first examined the cases and that defendants could contest evidence and call witnesses. Later historical accounts also emphasize how quickly the proceedings moved and how much judicial authority was concentrated in military institutions at the time.
One of the most senior men convicted in the first phase was Major General Iliya Bisalla, who had been Federal Commissioner for Defence. He was executed with other convicted defendants in March 1976. The case page does not assume that every person accused in the broader investigation had the same role or evidentiary basis.
Dimka's trial and execution
Dimka was tried in the later phase. Historical records describe him as the operational leader of the coup attempt: he was associated with the broadcast announcing the takeover and with the plot that resulted in the assassination of the Head of State.
On May 15, 1976, Dimka, former Benue-Plateau governor Joseph Gomwalk and five other convicted defendants were executed by firing squad in Lagos. A contemporaneous United States diplomatic cable records seven executions that day and notes that other defendants received life or lesser prison terms.
What is established — and what should not be overstated
The core facts are well documented: Murtala Muhammed was assassinated during the February 13 coup attempt; Dimka led the failed takeover; loyal forces defeated the coup; Dimka was captured, convicted and executed; and numerous other defendants received differentiated outcomes in military proceedings.
More controversial historical questions — including the full hierarchy of the conspiracy, the reliability of every accusation made during the crackdown and the role of people who were accused but not convicted — require greater caution. This page does not treat political suspicion, testimony from one plotter or retrospective theory as equivalent to an adjudicated finding.
Current status
The case is classified Solved / Adjudicated for Crime by Region because the assassination was connected to an identified coup organization and the principal operational plotter was captured, tried and executed, with extensive additional convictions arising from the same investigation. The historical military character of the proceedings remains part of the context and is not concealed.
Timeline
February 13, 1976: Murtala Muhammed, his aide-de-camp and driver are killed in Lagos during the attempted coup led by Buka Suka Dimka.
February 13, 1976: Dimka broadcasts that the government has been overthrown; loyal military units reject the takeover and restore control.
March 1976: Dimka is captured after a nationwide search. Special military tribunals process groups of suspected plotters.
March 1976: a first group of convicted defendants, including senior military figures, is executed; other defendants receive prison terms or are released.
May 15, 1976: Dimka, Joseph Gomwalk and five other convicted defendants are executed by firing squad in Lagos.
1979: the government that succeeded Muhammed completes its transition programme and transfers power to an elected civilian administration.