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>> The Potomac River rapist, thought to be responsible for eight rapes and one killing in the area in the mid-1990s, has been linked to another attack, reports the Post. After DNA evidence was re-tested, D.C. police were able to link the rapist to a 1996 sexual assault that took place along MacArthur Boulevard NW. The suspect, who police say is a black or black Hispanic man between 5-foot-8 and 6 feet tall, remains at large; the case will be featured on America’s Most Wanted on June 29.

>> MGM Resorts International is close to signing a deal with developers to build a high-end casino at the National Harbor, writes the Examiner. MGM is the biggest casino operator in Las Vegas, and it would bring the prestige that Maryland officials want for what would be the sixth gambling locale in the state. The casino, which could cost up to $1 billion to build, is expected to bring in $460 million a year for the state.

>> The National Park Service will start adding 46 signs and roadway markings near and on Memorial Circle to clear up the confusion that often causes accidents between cars, bicycles and pedestrians, reports WTOP. The signs will be done and installed by the end of summer. (Fun fact: though the circle is across the Memorial Bridge, it’s technically in D.C.)

Briefly Noted: Problems remain at Metro’s 122 emergency exits … Car crashes into Georgetown townhouse … Virginia board to vote on permanent new regulations for abortion clinics … New D.C. Council Chair pro tempore still owes back taxes.

This Day in DCist: On this day in 2011, an elderly Mt. Pleasant man was killed by police after barricading himself his apartment with a knife and “Washington” Redskins ranked second-to-last in franchise ratings. In 2010, we discussed why you shouldn’t trust news magazines’ school rankings.