MARKWEST ENERGY PARTNERS, L.P. 5,000,000 Common Units Representing Limited Partner Interests UNDERWRITING AGREEMENTUnderwriting Agreement • April 11th, 2008 • Markwest Energy Partners L P • Crude petroleum & natural gas • New York
Contract Type FiledApril 11th, 2008 Company Industry JurisdictionLEHMAN BROTHERS INC. MORGAN STANLEY & CO. INCORPORATED As Representatives of the several Underwriters named in Schedule 1 attached hereto, c/o Lehman Brothers Inc. 745 Seventh Avenue New York, New York 10019