Security forces inspect the site after an attack at the residence of Haiti's president Jovenel Moise in Port-au-Prince, Haiti on Wednesday. Photo: VCG

A former Haitian lawmaker who is a suspect in the assassination of the country's president has been arrested in Jamaica, Jamaican authorities said Saturday.

Ex-senator Jean Joel Joseph, wanted in the July 7, 2021, killing of president Jovenel Moise, was arrested Friday evening, the Jamaica Constabulary Force (JCF) said in a statement.

The JCF "can confirm that a Haitian national; Jean Joel Joseph and three other members [of] his family were arrested in Jamaica on immigration related charges," the statement said.

Jamaican investigators contacted Haitian authorities who said Joseph was "wanted in Haiti as a suspect in the alleged assassination of the Haitian President in 2021," it added.

Joseph was arrested at a house in St. Elizabeth, a parish in the southwest of the island.

A Jamaican police source told AFP that Joseph is "being detained at the moment."

The source said Jamaican police acted in conjunction with "international law enforcement partners" and that "joint investigations" had been underway.

Moise, who was unpopular in Haiti, was killed and his wife was seriously wounded when a commando of around 20 men burst into the presidential residence and shot them in July. 

Dozens of suspects had been arrested previously over Moise's murder, but much about the assassination remains murky, especially who ordered it.

An arrest warrant was issued for Joseph right after the killing, with authorities describing him as "armed and dangerous." Joseph was an opposition senator and fierce critic of the president. 

More than 40 people, including more than a dozen Colombians and some Americans of Haitian origin, have been arrested in connection with the serious assassination. 

The killing deepened an already dramatic crisis in Haiti, which is suffering from a lack of security, soaring gang violence and a spate of kidnappings.

Prime Minister Ariel Henry, who has in effect been running the country since Moise's death, told AFP in January that he too had been targeted in an assassination attempt, during national day celebrations.

In earlier January, US authorities charged a retired Colombian soldier in connection with Moise's killing.

The Justice Department said 43-year-old Mario Palacios, along with others, "participated in a plot to kidnap or kill the Haitian President."