More than 10 times the number of NYPD police officers have died in the 18 years since 9/11 as were killed in the terror attack on the World Trade Center itself. To date, 241 members of the NYPD died of 9/11-related illnesses -- compared to the 23 killed in the attack on the World Trade Center. The last 18 years have been just as devastating for the fire department. Twenty-two members of the FDNY have died of 9/11-related illnesses since the last anniversary. On Friday afternoon, their names will be added to the FDNY World Trade Center Memorial Wall. And today -- over 6,500 days after those attacks -- DNA testing is still being conducted to identify remains of those who perished in the towers. ABC News' Aaron Katersky is at Ground Zero and talks with Tony about what life is like nearly 20 years later.