ONEOK Partners to Participate in UBS MLP Conference

TULSA, Okla., June 1 /PRNewswire-FirstCall/ -- ONEOK Partners, L.P. (NYSE:
OKS) will participate in the UBS Master Limited Partnership Conference on
Wednesday and Thursday, June 3-4, 2009, in Las Vegas, Nev.John W. Gibson,
ONEOK Partners chairman and chief executive officer, will represent the
partnership at the conference.

A slide presentation will be available June 3 on the company's Web site,
www.oneokpartners.com.

ONEOK Partners, L.P. (NYSE: OKS) is one of the largest publicly traded master
limited partnerships and is a leader in the gathering, processing, storage and
transportation of natural gas in the U.S. and owns one of the nation's premier
natural gas liquids (NGL) systems, connecting NGL supply in the Mid-Continent
and Rocky Mountain regions with key market centers. Its general partner is a
wholly owned subsidiary of ONEOK, Inc. (NYSE: OKE), a diversified energy
company, which owns 47.7 percent of the partnership. ONEOK is one of the
largest natural gas distributors in the United States, and its energy services
operation focuses primarily on marketing natural gas and related services
throughout the U.S.

For more information about ONEOK Partners, L.P., visit www.oneokpartners.com.

OKS-FV

Analyst Contact: Christy Williamson
918-588-7163
Media Contact: Megan Washbourne
918-588-7572

SOURCE ONEOK Partners, L.P.

Analysts, Christy Williamson, +1-918-588-7163, or Media, Megan Washbourne,
+1-918-588-7572, both of ONEOK Partners, L.P.