The mother and daughter pair allegedly conspired to murder a young man called Jonier Alejandro Arenas who was killed on January 10th 2012, reported La Voz de Galicia on Thursday. 

Arenas died after a friend called him and told him to come down the street around midnight on that day.

When the young man arrived at the front door of his building, he was stabbed in the heart. 

Police investigating the murder drew a blank at  first. Arenas had no known enemies and was not involved in any illegal activities.

However, when agents of A Coruña's police force began looking into the young man's love life, they began to make progress.

Police discovered that the man with a Colombian background had a complicated romantic history.

They first found an ex-girlfriend, still a teenager. Then the trail to led to the girl's mother, who Arenas had also been sleeping with at one time, and the mother's new partner.

Also involved was another man — the new boyfriend of the teenager girl Arenas had been seeing.  

After further investigation the police came to the conclusion that the Arenas' ex-girlfriend and her mother planned the assassination.

The police allege the two women then asked their respective new boyfriends to carry out the act.

All of the accused — bar the ex-girlfriend of Arenas who is still underage — will this month go before the Provincial Court of A Coruña.

The director of public prosecutions is demanding a 20-year sentence for the three adults. The mother has been charged as the chief conspirator while the two men are charged with   carrying out the murder.

The ex-girlfriend, meanwhile, will faces changes in a juvenile court.

The events leading to Arenas' death began in 2009, reported La Voz de Galicia.

In that year, the young man started living with the older woman who is now facing 20 years' jail for plotting to kill him, according to Manuel Ferreiro, an expert in criminal matters.

The pair, however, separated after several months but did not stopping seeing each other or, occasionally, sleeping together.

At the same time, Arenas was alleging seeing plenty of other women, a fact which displeased his ex-lover .

The final straw, though, came when the young Casanova started sleeping with his ex-lover's young daughter.

Eventually, the secret came out and Arenas left both women.

The mother and daughter then allegedly planned to kill Arenas and recruited their new boyfriends for the task.

They explained that the daughter had been abused by Arenas and was pregnant to him.

The two boyfriends finally agreed to the act and — according to allegations — killed Arenas in January last year.