Your picture isn't the best, a closer detail of the leaves would help. Probably an ornamental purple-leaf plum cultivar along the lines of 'Newport', but a little hard to tell from the photo.

Thanks. Here is a better picture of the leaves.

Here is a link that might be useful: {{gwi:348075}}

Should add that the tree does not have any fruit.

Below is a fun website to play with- FWIW it said plum as well :)

Here is a link that might be useful: What tree is it?