"Kicks and punches" from the young man, as well as "an absence of immediate remorse".
Prosecutor Eric Corbaux delivered several information on the ongoing investigation into the death of young Alisha during a press conference.
The suspects, a teenager and his girlfriend confessed to the police.
The couple are suspected of having killed Alisha, a 14-year-old classmate in Argenteuil, on the banks of the Seine.
A conflict in love would be at the origin of the drama.
The young girl's body was found in the water of the Seine under a bridge on the A15 motorway.
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Teenage girl killed in Argenteuil: "It was my girlfriend, it's hard to hear that she died"
The facts took place Monday, March 8 between 1.35 p.m. and 4 p.m.
Indeed, at 1:35 p.m., Alisha spoke to her mother for the last time on the phone.
She was absent from her distancing class at 3 p.m.
The two minors involved, they met between 4 p.m. and 5 p.m. from the young man's home.