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KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

A manhunt in upstate New York and scandal swirling around former House Speaker Dennis Hastert are among the stories making headlines.

Good morning. Here are some of the stories we're following at NBC News:

1. Prison break: Hunting for killers and answers

There has been no sign of Richard Matt and David Sweat since they were reported missing on Saturday. Investigators say they used power tools to cut through brick and metal walls and pipes before breaking through a manhole to freedom. Read more in NEWS.

2. Most expect more acceptance in post-Caitlyn world

A majority of Americans believe that the high-profile transition of Caitlyn Jenner will help society become more accepting of transgender people, an NBC News survey found. Read more in NEWS.

3. Dennis Hastert hires high-profile lawyer

Former House Speaker Dennis Hastert has hired a high-powered Washington attorney who is a veteran of political scandals to represent him against federal charges that he lied to the FBI about bank withdrawals — money he allegedly used as payoffs to keep sexual misconduct accusations under wraps. Hastert will be arraigned at 3 p.m. ET. Read more in NEWS.

4. Exclusive: Patient with extreme TB sent to NIH

A female patient with an extremely hard-to-treat form of tuberculosis is being treated at the National Institutes of Health outside Washington D.C., and federal and state officials are now tracking down hundreds of people who may have been in contact with her. Read more in HEALTH.

5. 'Unspeakable tragedy': Hate-crimes cop shot dead

Constable Daniel Woodall, a 35-year-old father of two, was shot multiple times as officers responded to reports of a hate crime in the Alberta capital at about 8 p.m. local time (10 p.m. ET) Monday. Read more in NEWS.

6. 'Horrific' police beating in California caught on camera

The brutal aftermath of a violent confrontation last Friday between the police and a man in Salinas, Calif., was captured on camera, uploaded to YouTube and shows what the police chief there described as "horrific" and "inflammatory." Read more in NEWS.

7. Victim's family 'shocked' Pistorius could be released

Reeva Steenkamp's family was "shocked" to learn her killer Oscar Pistorius will likely be released from prison just 10 months into his sentence, a lawyer for the family told NBC News on Tuesday.