During a five-week trial the jury heard evidence about Ben Blakeley's controlling, abusive and violent relationship with his ex girlfriend, in which he allegedly punched, slapped and throttled her.
Staff at the One Foot Forward hostel where she lived reported the teenager calling her former partner, telling him she was pregnant with his child and arranging to meet him, all on the day before she died.
Blakeley had admitted killing Jayden but denied murdering her on a on a footbridge in open countryside near Upton, south of Didcot, on December 3 last year.
The jury has now found that he intended the teenager to die or suffer really serious injury during the incident, which left her with bruises on her face and neck.
He will be sentenced tomorrow.
The jury, on their fifth day of deliberations, has not yet returned a verdict on the charge against his brother Jake, 17, of preventing Jayden's unlawful burial.
They will continue their deliberation about Jake tomorrow.
Jayden was found in the grave of the pair's uncle in All Saints Church in Didcot on Deceber 18.
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