A newlywed who allegedly dumped his dead American wife at a Mildura hospital posted online about her dying in his arms, just hours before his arrest.

Preston man Steven Samaras posted on his Facebook page on Monday night that his new wife, whom he named as Tamara Turner, was taken from him.

Preston man Steven Samaras posted this photo of his partner, whom he names as Tamara Turner, in a tribute to her before his arrest. Credit:Facebook

"Fly high with the angels, your [sic] taken from me in this life gorgeous, but I will be with you in the next life," he purportedly wrote.

"U didn't want to lose me and I lost you ... Passing away in my arms hurt me, I don't know what to say to the kids either."