Partly sunny today, with highs in the mid 80s. The weekend will be hot and humid, with highs in the mid 90s and the chance of storms.

OrderUp, the local restaurant-delivery startup, is being acquired by Groupon, the company that’s probably still sending you emails about discounted teeth whitening. Terms of the deal are undisclosed. With the daily deals fad fading, Groupon has been searching for ways to diversify its business. OrderUp will keep its Baltimore headquarters, while enjoying access to Groupon’s large customer base (OrderUp currently delivers in about 40 markets, mostly college towns and smaller cities that’ve been overlooked by competitors like GrubHub).

In Perry Hall, a father shot and killed his 12 and 10-year-old sons before taking his own life.

Chief Baltimore Police spokesman Capt. Eric Kowalczyk is leaving the department to form his own communications consulting company. Kowalczyk is cited for increasing the department’s (sometimes weird) use of social media, but has also been criticized for a “credible threat warning” from the BPD media on April 27th (discredited by the FBI almost immediately).

Police are asking anyone that grabbed cash from the 895 tunnel on Wednesday to give it back, pretty please. Late Wednesday, an armored truck dumped an unknown amount of money in the tunnel, closing it for hours. While most drivers on the scene were cooperative, investigators believe some cash is missing – with a 5pm Saturday deadline for grabbers to return it, or else.

It’s Artscape weekend, so you have a lot of can’t-fail options. Here are the Sun’s 6 events not to miss. City Paper’s sprawling coverage is here. Baltimore magazine’s roundup is here. Here’s the full lineup. SouthBmore.com has your non-Artscape rundown of events.