The Euro Stars AAA-rated Marra had served as a co-lead manager on the fund since October 2006. He had been noted for strong performance both on an absolute and a risk-adjusted basis.
Existing co-lead manager Rick Rieder and junior manager Bob Miller will assume full responsibility for the Luxembourg-domiciled fund.
A spokesperson for BlackRock told Citywire Global that Marra is now focusing on the firm's strategic development and Pellicciaro had opted to leave the company in order to pursue new opportunities.
The decision by Marra to step down from the US bond fund marks the second such change on a major BlackRock fund in the past few weeks.
Marra appeared in recent Citywire analysis for his strong performance during the first four years of President Obama’s administration, as well as being among the top US bond managers following QE2.
Marra joined BlackRock’s fixed income team in 1997 and had co-run the BGF US Dollar Core Bond fund with Rick Rieder since August 2010 when Rieder replaced Curtis Arledge.
Rieder was highlighted by Citywire Global in November of last year as part of the Rising Stars feature of the magazine.
Over the past three years, the BGF US Dollar Core Bond fund has returned 26.16%. This compares to its Citywire benchmark, the Barclays US Aggregate Bond TR, which rose 19.38% over the same period.