Source?

It seems there's a counter claim that he didn't.

> Ross was smeared with unprosecuted, false allegations of planning murder-for-hire that never occurred, were never proven, never ruled on by a jury, and were ultimately dismissed with prejudice.

https://freeross.org/case-overview/

>The district court found by a preponderance of the evidence that Ulbricht did commission the murders. The evidence that Ulbricht had commissioned murders was considered by the judge in sentencing Ulbricht to life and was a factor in the Second Circuit's decision to uphold the sentence.

https://en.wikipedia.org/wiki/Ross_Ulbricht